SUMMARY Install Kmail 5.13.3 in Kubuntu 20.04 via Muon. Setup Kmail with two accounts - as per working settings with Kmail 5.11.3 on Kubuntu 19.10. Kmail receives mail from both accounts but cannot send from either. STEPS TO REPRODUCE 1. Start laptop - Message displays: The mail dispatcher is offline, so mails cannot be sent. Do you want to make it online? -Clicking yes. 2. Mail will not send. Mail goes to Local folder - Outbox 3. Open Akonadi Console. Toggle Mail dispatcher offline and back online. 4. Go to Outbox and send mail. 5 Recieve message: E-Mail sending failed. Failed to transport message. Server error 5.7.8 Error authentication failed. UGFvcmQ6zc3d OBSERVED RESULT Failure to send EXPECTED RESULT Messages send as per 19.10 configuration SOFTWARE/OS VERSIONS Operating System: Kubuntu 20.04 KDE Plasma Version: 5.18.4 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8 Kernel Version: 5.4.0-28-generic OS Type: 64-bit Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz Memory: 31.2 GiB of RAM Kmail: 5.13.3 (19.12.3) ADDITIONAL INFORMATION
SOLVED: I manually deleted all .config and .local files relating to Kmail and Akonadi, uninstalled Kmail and Akonadi then reinstalled both. Mail now sends!